        :after  (fn [context]                         ;; you normally want to change :effects
                  (let [db (get-effect context :db)]  ;; (get-in context [:effects :db])
                    (assoc-effect context :http-ajax {...}])))))
+   ```
 
    "
   [& {:as m :keys [id before after]}]

           [coeffect event]
           ... in here can access (:now coeffect) to obtain current datetime ... )))

   Background
   ----------

   `coeffects` are the input resources required by an event handler
   to perform its job. The two most obvious ones are `db` and `event`.

  two are really just sugary variations.

  1. No input signals given:
     ```clj
     (reg-sub
       :query-id
       a-computation-fn)   ;; has signature:  (fn [db query-vec]  ... ret-value)
